SharePoint 2013 workflow got cancelled with HTTP 401

SharePoint 2013 workflow got cancelled and found the below error

RequestorId: 2835896c-3aff-232c-10b0-da0b18ec10de. Details: System.ApplicationException: HTTP 401 {"error_description":"The server was unable to process the request due to an internal error. For more information about the error, either turn on IncludeExceptionDetailInFaults (either from ServiceBehaviorAttribute or from the <serviceDebug> configuration behavior) on the server in order to send the exception information back to the client, or turn on tracing as per the Microsoft .NET Framework SDK documentation and inspect the server trace logs."} {"x-ms-diagnostics":["3001000;reason=\"There has been an error authenticating the request.\";category=\"invalid_client\""],"SPRequestGuid":["2835896c-3aff-232c-10b0-da0b18ec10de"],"request-id":["2835896c-3aff-232c-10b0-da0b18ec10de"],"X-FRAME-OPTIONS":["SAMEORIGIN"],"SPRequestDuration":["32"],"SPIisLatency":["5"],"Cache-Control":["private"],"WWW-Authenticate":["Bearer realm=\"9a5e4a6b-4ab4-4cd5-a2c2-b1b60f387c21\",client_id=\"00000003-0000-0ff1-ce00-000000000000\",trusted_issuers=\"00000005-0000-0000-c000-000000000000@*,11111111-1111-

      Resolution:     

•      Don’t use system account for workflow creation and publishing.
•      Ensure User profile synchronization service is started (also ensure both FIM Services are started).
•      Ensure user profile service application has been associated to the web application

If the above solution are not working then follow the below links which may resolve the issue.

https://social.msdn.microsoft.com/Forums/Lync/en-US/ab4015a3-e9d1-4e16-ad41-92d7b15a8856/workflow-internal-status-suspended-error-401?forum=appsforsharepoint

https://docs.microsoft.com/en-us/sharepoint/dev/general-development/create-a-workflow-with-elevated-permissions-by-using-the-sharepoint-workflo

For my case the user profile service application not associated to the web application. 

Not running in high contrast, so we will paint the background with our trademarked image(event id 10010 & Event id 103)

I got the below errors in the Event logs and SharePoint PS configuration logs while I am installing SSRS Add-in on Sharepoint 2013.

Event ID: 10010

Application ‘C:\Program Files\Microsoft Office Servers\15.0\Search\runtime\1.0\noderunner.exe’ cannot be restarted. Application SID does not match Conductor SID.

Application ‘C:\Program Files\Microsoft Office Servers\15.0\Bin\mssdmn.exe’ cannot be restarted. Application SID does not match Conductor SID.

Event Id 104

Failed to Install the application content files.

An exception of type system.NullReferenceException was thrown. Additional exception information:Object reference not set to an instance of an oject.

System.NullReferenceException: Object reference not set to an instance of an object.

 At Microsoft.Sharepoint.Administration.SPAspConfigurationFile.ApplyActionToXmlDocument(XmlDocument xdAction,XmlDocument Xd

SharePoint PS Configuration error:

Not running in high contrast, so we will paint the background with our trademarked image

Resolution:

Finally found that the cause for the above issue is that SharePoint web application web configs contains comments <!.. ..> Entry.

The issue was resolved by deleting comments entries in the web configuration files for all the SharePoint web application for my case.